Tom,
Thanks for the feedback. The 5'/sec. velocity may be a good question to ask. I
have worked on several warehouse projects with HVLS fans in the last year and a
half.
This isn't your typical office HVAC system. Shouldn't we be concerned with
having the Sprinkler head over the fire operate and not the one 25' away
possibly going off first.
Regards,
G. Tim Stone
G. Tim Stone Consulting, LLC
NICET Level III Engineering Technician
Fire Protection Sprinkler Design
and Consulting Services
117 Old Stage Rd. - Essex Jct., VT. 05452
CELL: (802) 373-0638 TEL: (802) 434-2968 Fax: (802) 434-4343
[email protected]
-----Original Message-----
From: Sprinklerforum [mailto:[email protected]] On
Behalf Of Tom Wellen
Sent: Thursday, April 23, 2015 9:59 AM
To: [email protected]
Subject: Re: Cow Barn Ventilation
Tim,
I thought the concern was mainly for storage sprinklers? I don’t think NFPA 13
addresses effects of ventilation on sprinklers except for HVLS fans.
Exerpt from a past informal interpretation regarding FM:
FM Global specifically addresses forced-air flow from ventilation equipment on
storage sprinklers in Data Sheet 2-0 dated April 2011. Section 2.2.1.8, Airflow
Velocities at Ceiling-Level Sprinklers, says to arrange air-handling equipment
(and similar devices that discharge air into a protected area) so the
multidirectional airflow velocity at any ceiling-level storage sprinkler does
not exceed 5 ft/s. The FM standard describes two approaches if it is not
possible to avoid airflow velocities in excess of 5 ft/s at ceiling-level
Storage sprinklers. One is to install a false ceiling under an air vent. The
other is to install heat/flame detection or line-type heat detection within
storage racks to automatically shut down the flow of air upon detector
actuation. Additional guidance is provided for each approach that can be found
in that document.
There was also a study regarding activation of sprinklers affected by HVAC
ventilation for standard and QR sprinklers. There was an effect on the
activation time, but not enough to worry about it. I can’t place my fingers on
it at this time.
Tom Wellen
> On Apr 23, 2015, at 7:39 AM, Tim Stone <[email protected]> wrote:
>
> I am in the early stage of Sprinkler design for a new Research Cow
> Barn and Milking Parlor.
>
>
>
> It is a Wood Frame Structure with a 4:12 pitich roof. The barn and
> milking parlor both have finished ceilings at [13'-6] above a concrete slabs.
>
>
>
> The Barn and Milk Parlor are to be equipped with Ventilation equipment
> consisting of 6- 30,000 CFM, 1 - 86,000 CFM directional flow
> circulation fans mounted/suspended at the ceiling, 4 - 72" wall
> mounted exhaust fans at one end of the barn.
>
> Also there are 14 automatically actuated ceiling air inlets in the cow
> barn and another 8 manually actuated inlets in the Milking parlor.
>
>
>
> There is no indication on the Electrical or Mechanical Bid Documents
> that the ventilation system is tied into the Fire Alarm Panel. I have
> submitted a RFI to the General Contractor asking just this question.
>
>
>
> My question to you is, In a warehouse the ventilation system is tied
> in to the fire alarm for shutdown. Shouldn't this Research Cow Barn be
> treated the same way?
>
>
>
> Thank you in advance.
>
>
>
> Regards,
>
> G. Tim Stone
>
>
>
> G. Tim Stone Consulting, LLC
>
> NICET Level III Engineering Technician
>
> Fire Protection Sprinkler Design
>
> and Consulting Services
>
>
>
> 117 Old Stage Rd. - Essex Jct., VT. 05452
>
> CELL: (802) 373-0638 TEL: (802) 434-2968 Fax: (802) 434-4343
>
> <mailto:[email protected]>
> [email protected]
>
>
>
> _______________________________________________
> Sprinklerforum mailing list
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